2001 Cadillac Seville Owner's Manual - Page 325

4. Turn on the low beam headlamps and place a piece of cardboard or equivalent in front of the headlamp not being aimed. This should allow the beam cut-off of the headlamp being aimed to be seen on the flat surface. 5. Turn the vertical aiming screw (C) until the headlamp beam is aimed to the horizontal tape line. NOTICE: Do not cover a headlamp to improve beam cut-off when aiming. Covering a headlamp may cause excessive heat build-up which may cause damage to the headlamp. 6-43